statisticsEl Nino and the mosoon. The earth is interconnected. For example, it appears that El Nino, the periodic warming of the Pacific Ocean west of South America, affects that the monsoon rains that are essential for agriculture in India. Here are the monsoon rains (in millimeters) ...
January 14, 2013

ScienceTen pounds of liquid water is at a temperature of 180 degrees F at standard atmospheric conditions. Determine the energy required to convert this to water vapor (steam) at a temperature of 212 degrees F.
September 3, 2012

mathA lawn sprinkler covers a rectangular pattern of 20ft x 30ft. 1)If the flow rate of the sprinkler is 2.5 gpm, derive a formula for calculating the time (hours) to apply D inches of water over one 20ft x 30ft area. 2)What are the units on the constant?
March 31, 2012

math - help pleaseA lawn sprinkler covers a rectangular pattern of 20ft x 30ft. If the flow rate of the sprinkler is 2.5 gpm, derive a formula for calculating the time (hours) to apply D inches of water over one 20ft x 30ft area. 2)What are the units on the constant?
March 30, 2012

mathA lawn sprinkler covers a rectangular pattern of 20ft x 30ft. 1)If the flow rate of the sprinkler is 2.5 gpm, derive a formula for calculating the time (hours) to apply D inches of water over one 20ft x 30ft area. 2)What are the units on the constant?
March 30, 2012

mathA triangle has an angle whose sine is equal to sq rt 2/2. The angle is larger than 52 degrees in measure. Find the EXACT measure (in degrees) of the angle.
November 25, 2011

Econ more help pleaseSee question below at **** Suppose local govt decides that a tax is the best way to address the inefficiency created by outdoor concerts. Assuming the social cost curve and the private cost curve are parallel to each other, how much does the tax on concerts have to be to ...
November 14, 2011

Econ - urgent please helpSuppose local govt decides that a tax is the best way to address the inefficiency created by outdoor concerts. Assuming the social cost curve and the private cost curve are parallel to each other, how much does the tax on concerts have to be to achieve the socially optimal ...
November 14, 2011

Econ please helpSuppose local govt decides that a tax is the best way to address the inefficiency created by outdoor concerts. Assuming the social cost curve and the private cost curve are parallel to each other, how much does the tax on concerts have to be to achieve the socially optimal ...
November 13, 2011

algebraTown has popultion of 5,000.Number of people infected after t days with a disease is N(t) = 5000/1 + 21.7e^-0.4t Find number initially infected find number infected after 12 days
November 6, 2011

algebra Pa^t and Pe^rt are two forms of the same exponential function. One would expect to obtain the same answer for f(18). Explain why you may not get the same answer for f(18) in practice.
November 5, 2011

math - another ? - exponentialsThe two formulas f(t) = Pa^t and f(t) = Pe^rt provide two models for the same exponential growth or decay function. How are the exact values of a and r related? (Hint: Find a formula for a as a function of r)
November 4, 2011

algebra - exponentialsPa^t and Pe^rt are two forms of the same exponential function. One would expect to obtain the same answer for f(18) (after finding P and a and P and r). Explain why you may not get the same answer for f(18) in practice.
November 4, 2011

algebra$7,000 is invested into two accounts: 4,000 into an account paying 5% interest compounded monthly and $3,000 into an account paying 4.1% interest compounded continuously. compute the total interest earned at the end of 2 years.
October 31, 2011

algebrarectangular open-topped box is made from a 9 x 16 piece of cardboard by cutting x-inch squares out of each corner and folding up the sides. What size square should be cut out to produce a volume of 120 cubic inches?? I set it up with 120 = (16-2x)(9-2x)(x) I get to y = 2x^3 - ...
October 16, 2011

Geometry2. This cone bottom tank is the perfect solution for transporting chemicals such as pesticides around to various locations. The cone shape of this plastic tank equips it not only for easy draining of materials, but also provides an easy cleaning process. a. What is the volume ...
October 13, 2011

GeometryAn engineer designed a 620 ft long water canal to drain a rainwater detention pond. It is to have a trapezoid cross-section that is 8 ft deep, 15 ft across the bottom, with walls sloping outward at an angle of 40. (a)Calculate the volume of earth that needs to be ...
October 12, 2011

MathsThe fuel rods for a certain type of nuclear reactor are bundled into a cylindrical shell. Consider this cross-section showing 19 identical fuel rods: a) If the diameter of the one rod is 2.8cm, calculate the shaded area of the cross-section. b) If the length of the cylindrical...
October 12, 2011

algebrawhy are these equations poor models of hitting a baseball: y= -0.002x(x-433.1) I get maximums of (216,93). Other problems' maximums are in the (220, 100)range. So are they poor models because the distance and heights are unreasonable? 2) Why is the constant a in y=ax^2 + ...
October 8, 2011

algebraIn a real-life situation, to model the distance x and the height of hitting a baseball y as in: y = ax^2 + bx + c 1. When dealing with the initial height of the ball, what is happening when x = 0? Is it that the ball has not yet traveled any distance? 2. What are the possible ...
October 8, 2011

mbaFind the maximum and minimum values of the following function. 8x3  75x2 + 150x
October 8, 2011

physicsHow do we compensate for thermal expansion /contraction in the construction of railway tracks? How do we compensate for thermal expansion /contraction in the construction of steel bridges? How do we compensate for thermal expansion /contraction in the construction of metal ...
October 4, 2011

physicsDescribe briefly how the volume of a given mass of water changes when it is cooled from 7 ^0 C to 1^0 C use the terms increase, decrease and maximum or minimum
October 4, 2011

physicsAt what temperature is the density of water MAXIMUM ? Why does water have a maximum density ( Other liquids do not)
October 4, 2011

physicsA liquid expands on heating. Explain briefly how its density will change with rise in temperature
October 4, 2011

physicsliquids in general expand on heating but when water in an ordinary glass flask with a narrow neck is heated the level is found to first fall and then rise why ?
October 4, 2011

physicsIf velocity v of particle moving in straight line is related with distance travelled S as v=2(1+S)^1/2. Find the acceleration of the particle.
July 20, 2011

physicsA partical is projected vertically upward with speed 20 m/s. What will be the time after particle is at a height 15m above the ground( g=15 m/s*s)
July 20, 2011

physicsA non stop bus goes from one station to another at a speed of 54 km/h. The bus returns from the second station to first station at a speed of 36 km/h. Find the average speed of the bus.
July 3, 2011

geometryfind the equation to the plane through the point (-1,3,2) and perpendicular to the plane (x+2y+2z=5) and (3x+3y+2z=8)
February 24, 2011

math first of all multiply 11 by 3 we get 33 now we add 1 to 33 , we get 34 so the result is - 34 / 3 the negative sign is with the whole term so it will remain with the whole fraction
February 23, 2011

physics2.5 kg rifle fires a 20 g bullet at 400 m/s. Find magnitude of the recoil velocity of the rifle.
February 7, 2011

physicsStar Z has 1/5 the radius of Earth and 1000 times the Earth's mass. If a mass weighs 1.0 N on Earth, what does it weight on Star Z? Thank you.
January 25, 2011

physicsA chain of length l and mass ë per unit length is fully open and is held on a high frictionless table with y1 of its length hanging from the side of the table as shown in figure. When released, it starts slipping off the table. By calculating the speed of the chain as it ...
October 29, 2010

physicsA small stone of mass m is stuck on the periphery of a wheel of radius R rolling along the x-axis with a constant speed v. The centre of the wheel was at x = 0 at time t = 0, and stone was on the ground at that time. Find the angular momentum of the stone and its rate of ...
October 23, 2010